Process for preparing molds.



- UNITED STATES PATENT orrion.

WILLIAM R. CONARD, OF BURLINGTON, NEW JERSEY. l

PROCESS FOR PREPARING MOLDS.

Specification of Letters Patent. Patented Feb. 18, 1913.

No Drawing. Original application filed August 6, 1912, Serial No. 713.690. Divided and this application filed November 27,- 1912.

To all whom it may concern Be it known that 1, WILLIAM R. CONARD, a citizen of the United States, residing at Burlington, in the county of Burlington and State of New Jersey, have invented a new and useful Process for Preparing Molds, of which the following is a specification.

This application aims to provide a novel process for preparing a mold, and the subject matter of this application has been divided out of my co-pending application for Letters Patent upon a process and compound for casting, Serial No. 713,690, filed August 6, 1912.

In carrying out the process herein disclosed, waste material from a foundry c'upola or air furnace, commonly known as foundry slag, is employed. The slag is ordinarily of arfibrou's nature, and when it comes from the furnace in masses too large for immediate'use/I comminute the slag by crushing, grinding or otherwise, to a fine and preferably impalpable powder, although the fineness of the co-mminuted slag will depend upon the nature of the casting which is to be produced. The slag should be in a dry condition, and if it is moist, either before or after being comminuted, it may be dried, either before or after the comminuting process take place. The comminuted slag is then mixed with an hydraulic cement, either natural Rosendale) or artificial (Portland) cement eing employed, the cement, of course, being in a dry condition. Ordinarily, one part of cement and two parts of slag are employed, but considerable latitude may be permitted in the proportions of the ingredients. The operator will be guided by the size of the casting which is to be produced, and by other conditions which are known in the art. Ordinarily, if the castings which are to be produced are of considerable dimensions, the amount of cement may be reduced, so as to secure a more porous aggregate, whereby the gases gegierated in the casting operation may escape readily. After the comminuted slag and cement have been mixed .thoroughly, in a dry condition, water or other liquid is added, in order to make the vmass plastic. The plastic mass is thoroughly mixed until it is of a uniform and homogeneous nature. The aggregate, in a moist plastic condition, is applied to a pattern, and in this connec- Serial No. 733.906.

the pattern, bv rubbing, pressing or other- 4 wise, so that all of the lines of the pattern are enteredby the aggregate. If necessary, the aggregate appliedto the pattern may be permitted to take an initial'set or a final set, this step in the process depending largely upon the amount of liquid which has been introduced into the aggregate. The pattern is then removed from the aggregate, the same now coiLforming to the pattern, and constituting the mold. All moisture is removed from the mold, and this step may be consummated either by permitting the mold to dry out in the atmosphere, or by the application of heat.

The'process hereinbefore. referred to may be employed with equal'pr'opriety for making the drag, the cope, or the core.

A molding clement, constructed as above described, may be used repeatedly, and the employment of gaggers will be unnecessary. Molding elements constructed as above described, will be suitable for casting in a wide variety of metals. such as iron, bronze, brass, babbitt, lead and the like, and by the practice of the above described process, a casting will be produced which will be devoid of imperfections, and which will be superficially smooth; I a 7 Patterns of wood, metal or 1-1. ober, depending upon the nature of the work, may

be coated as abqve described, and in carrying out the inyention, the expense for material and labbr will'be reducedfto athe aggregate; mixing the moist aggregate;

applying the moist aggregate to a pattern; forcing the moist aggregate into the inter stices of the pattern; removing the pa.t tern; and removing the moisture'from the aggro gate.

2. A process of preparing a mold, which In testinmny that I claim the foregoing as my own, I have hereto afl'lxed my slgnnture in the presence of two wltnesses.

\VILLIA M 1;. CONARD,

Consists in mixing cumminnted foundry stag with hydraulic cement, in a dry condition, to form a homogeneous aggregate, nmistenthe nggregete; applying the uggregt te in a mom eonchtlon to a pattern; pernntting the aggregate to' take a set upon the pattern; and ren'leving the pattern.

\Yitnesses J. S. Bowman (7. A. PRICE Jr. 

